include<tools/util.scad>
$fn=100;
difference(){
    minkowski(){
        cube([22,38,12]);
        sphere(1);
    }
    translate([-1,-1,12]) cube([24,40,4]);

translate([12,7,9]) d_2_circle_slot(radius=4,height=3,width=24);
translate([12,-1,12]) rotate([-90,0,0]) d_arc_cylinder(radius=2, height=5, angle=180);
translate([12,34,12])rotate([-90,0,0]) d_arc_cylinder(radius=2, height=5, angle=180);
translate([24,20,12])rotate([-90,0,90])  d_arc_cylinder(radius=2.5, height=10, angle=180);
}

